Other Parts Discussed in Thread: BQ76920, BQ78350, BQ29312A, BQ20Z80
Hi, teem,
Customer inquired TI's products for the following application.
For my application, the charger/battery pack (‘s) will be mounted on a diesel vehicle and will be fed from a 12VDC or 24VDC (depends on the vehicle type as to the alternator voltage). The actual starting of the diesel engine is via an air driven starter motor. The battery packs basically allow the ignition to be turned ON, start-up sensors monitored, initial driving of the injector solenoids and initiate the starting of the pneumatic starter motor.
I have a few questions:
1. Does TI have a power managing IC that can be connected after the Alternator input and protect against things like a) reverse polarity, b) over voltage, c) general noise suppression etc prior to the battery charging IC? Noise from the alternator could be in the region of 40..50V. Expected maximum current flow at this point is a maximum of 10A.
2. With regard to a battery charging IC, I would like to charge the battery at the same time as provide power downstream to other circuitry. What do you recommend for a charging IC?. The nominal input voltage to the charger will be somewhere between 10V and 24V. I have detailed the cell specs below.
3. As I mentioned above in the second line of this email, out of you seven choices of IC’s, I a bit confused on a direction to take. They all look very similar. As an example, the bq78350 & the bq76920 both do cell balancing.
4. Is it possible to have a 4S2P configuration with any of your IC’s?
5. I think I read some 9 months ago that you had over temperature fuses that supported your battery technology.
I will use I2C or SMBus to communicate to the charger / fuel gauge / Monitoring IC’s. I need to know the state of charge, discharge, capacity & health of the packs. I will also need to incorporate active cell balancing.
Our old battery management solution uses the following NRND IC’s
・bq20Z80 and bq29312A
・bq24745RHDT
I will be using SAFT cells:
・Li-ion cells.
・5.6AH.
・Nom 3.65V, Full Charge 4.2V.
・Max Charge 5.6A. (1C).
・Expected discharge ~11A. (2C)
We appreciate your recommendations.
